JP2932739B2 - Induction cooker cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cooling of heat-generating components in an electromagnetic cooker.

[0002]

2. Description of the Related Art In recent years, electromagnetic cookers have become highly efficient and safe.
Attention has been paid to its excellent properties, and the development of electromagnetic cookers has become active. In addition, in order to improve the cookability of an electromagnetic cooker, a heater having a higher heating power has been required, and as a result, electric loss of a heating element such as a switching element of an induction heating circuit has increased, resulting in a higher performance. Cooling is being demanded.

[0003] A conventional electromagnetic cooker will be described below. FIG. 5 is a side sectional view of a conventional electromagnetic cooker. FIG.
, 1 is a plate. Reference numeral 2 denotes a frame to which the plate 1 is fixed. Reference numeral 3 denotes a resin case, which has an inlet 4 on the front and an outlet 5 on the rear. Also,
The frame 2 and the main body case 3 are fixed. Reference numeral 6 denotes a cooling fan provided in the vicinity of the intake port 4.
One heat sink 7 is provided in the vicinity of the air outlet. A switching element 8 is attached to the heat sink 7.

[0004] A temperature sensor 9 is fixed to the heat sink 7. Reference numeral 10 denotes a drive circuit, and a switching element 8
, The temperature sensor 9 and the heating coil 11. Reference numeral 12 denotes a pot placed on the plate 1. The arrows in the figure indicate the flow of the cooling air.

The operation of the electromagnetic cooker configured as described above will be described below. Pot 12 on plate 1
, And by turning on a switch of an operation unit (not shown), the switching element 8, the heating coil 11, the drive circuit 10 and the like provided inside the main body can be operated and heated. At this time, it is necessary to suppress a rise in the temperature of the switching element 8 inside the main body, and the cooling fan 6 blows air to the heat sink 7 to cope with it.

If the temperature of the switching element 8 rises abnormally due to a failure of the cooling fan 6 or the like, the temperature sensor 9 attached to the heat sink 7 operates to stop the heating operation of the drive circuit 10 and to safely operate. Sex will be maintained.

[0007]

However, the above-described cooling configuration is for a circuit composed of one switching element 8, and a cooling system for a circuit composed of two switching elements has a cooling balance between the two switching elements. It was necessary to further improve the cooling performance while maintaining the same. In addition, in a circuit using two switching elements, it is necessary to reduce the distance between the two elements in order to minimize the loss on the elements. Further, when the cooling fan 6 fails, the temperature sensor 9 operates to prevent abnormal heating of the heat sink 7 by the switching element 8. However, when the temperature sensor 9 fails, the main body case 3 is melted. , Fumes could ignite.

[0008] Even if two stones are used, it is necessary to simplify the assembly. SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. The cooling of a circuit using two switching elements is performed in a well-balanced and efficient manner, and the distance between the two switching elements is reduced as much as possible. A first object is to provide a cooling device for an electromagnetic cooker in which such loss is reduced.

A second object of the present invention is to provide a cooling device for an electromagnetic cooker using two switching elements which does not emit smoke or fire even if the cooling fan fails and which is easy to assemble.

A third object of the present invention is to provide a cooling device for an electromagnetic cooker using two switching elements which can efficiently use cooling air and have improved cooling performance.

[0011]

In order to achieve the first object, a cooling device for an electromagnetic cooker according to the present invention has a heating coil, a heat sink, a drive circuit, and an axial cooling fan inside a main body. The heat sinks are placed face-to-face at almost symmetrical positions, with the plane perpendicular to the rotation axis of the cooling fan as the symmetry plane, and at the facing inner surfaces of both heat sinks and near the rotation center of the cooling fan. A switching element is provided, and both switching elements are electrically connected. Both heat sinks are cooled by blowing air from a cooling fan, and are driven by two switching elements.

According to a second aspect of the present invention, there is provided a cooling apparatus for an electromagnetic cooker, comprising a heating coil, a heat sink, a drive circuit, and a cooling fan inside a main body, wherein the heat sinks are arranged to face each other. The heat sink flanges are protruded from the opposite surfaces of both heat sinks, the lower surface of the heat sink is made of resin, fixing bosses for fixing the heat sink are set up from the resin surface, and the heat sink flange and fixing boss are fixed. It is driven by a stone switching element.

Further, in order to achieve a third object, a cooling device for an electromagnetic cooker according to the present invention has a heating coil, a heat sink, a drive circuit, and a cooling fan inside a main body, and arranges the heat sinks facing each other. The two heat sinks are driven by two switching elements each having a partition wall on the opposite surface facing each other.

[0014]

According to the first technical means, by setting the heat sinks facing each other at substantially symmetrical positions with the plane perpendicular to the rotation axis of the cooling fan as a symmetrical plane, substantially the same amount of cooling air is supplied to both heat sinks. You can hit
Cools well balanced. In addition, by providing the switching element on the inner surface facing both heat sinks and at a position near the center of rotation of the cooling fan, the vicinity of the swing element side where cooling fins of the heat sink cannot be formed much is
The cooling fan is provided at a position near the center of the cooling fan having a slow cooling wind speed, and a configuration in which a large number of cooling fins of a heat sink are provided near the outer periphery of the cooling fan having a fast cooling speed is facilitated, so that the cooling performance can be improved.

Further, the electrical connection length between the two switching elements can be shortened, whereby the delay of the switching operation is reduced, and as a result, the electrical loss applied to the switching elements can be reduced.

According to the second technical means, the heat sinks are arranged to face each other, the flange portions of the heat sinks are protruded from the opposing surfaces of both heat sinks, the lower surface of the heat sink is made of resin, and the heat sink is fixed from the resin surface. By raising the fixing boss, if the heat sink abnormally generates heat due to failure of the cooling fan, etc., the resin part supporting the heat sink softens, and the heat sink supported by the fixing boss is placed on the opposite side of the center of gravity side When the heat sinks that fall down and come into contact with each other with different potentials are electrically short-circuited, a safety device such as a fuse is activated, and as a result, smoke and ignition can be suppressed. In assembling the heat sink, it is not necessary to fix a difficult-to-assemble portion such as a portion where the two heat sinks face each other, and it is only necessary to fix the flanges at both ends.

Further, since the partition wall is provided on the opposite surfaces of the two heat sinks by the third technical means, the cooling air is less scattered, and the cooling air is concentrated around the heat sink to improve the cooling performance. Can be improved.

[0018]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a main part of the cooling device of the electromagnetic cooker according to the present embodiment, as viewed from the rear, FIG. 2 is a cross-sectional view of a main part of the cooling device, viewed from the top, and FIG. It is a side sectional view. 1, 2 and 3, reference numeral 13 denotes an axial cooling fan, which is mounted in front of the heat sinks 14a and 14b. Reference numerals 15a and 15b denote switching elements which are attached to the respective heat sinks 14a and 14b. 16a and 16b are substrates for switching elements,
It is electrically connected to the switching elements 15a and 15b. Reference numerals 17a and 17b denote resin insulating plates, which are heat sinks 14a and 14b and switching element substrates 16a and 1b.
6b.

Cooling fins 18a, 18b, flange portions 19a, 19b, and partition walls 20a, 20b on the heat sink side are simultaneously formed on the heat sinks 14a, 14b. 21a and 21b are case-side partition walls provided on the resin-made main body case 22. Reference numeral 23 denotes a rib formed on the main body case 22 that supports the heat sinks 14a and 14b. 24a, 24b are heat sinks 14a, 14
This is a fixing boss for screwing b. Reference numeral 25 denotes a temperature sensor, which is attached to the heat sink 14b. 26 is a plate. 27 is a frame to which the plate 26 is fixed.

The main body case 22 has an intake port 28 on the front and an exhaust port 29 on the rear. Reference numeral 30 denotes a drive circuit, which includes substrates 16a and 16b for switching elements and a heating coil 31.
Is electrically connected to Numeral 32 denotes a pot of the object to be heated. Arrows in the figure indicate the flow of the wind.

The operation of the electromagnetic cooker configured as described above will be described below. Pot 3 on plate 26
2 and turning on a switch of an operation unit (not shown), a switching element 15 provided inside the main body is provided.
a, 15b, the heating coil 31, the drive circuit 30, etc. operate to perform induction heating. At this time, since both the switching elements 15a and 15b generate heat, both the heat sinks 14 which help the heat dissipation of the switching element 15 are generated.
Although it is necessary to cool the heat sinks 14a and 14b in a well-balanced and efficient manner, in the present embodiment, the surfaces perpendicular to the rotation axis of the cooling fan 13 are set as symmetrical surfaces, and the two heat sinks 14a and 14b are placed at substantially symmetrical positions. Since it is installed, the same amount of cooling air can be applied to each, and cooling can be performed in a well-balanced manner. Further, since the cooling fan 13 is of the axial flow type, the wind speed near the center of the fan is slow and the wind speed near the outer periphery of the fan is fast as shown by arrows A and B in FIG. In the vicinity, a large number of cooling fins 18 of the heat sink 14 are provided near the outer periphery of the fan having a high wind speed to improve the cooling performance.

Also, the heat sink side partition walls 20a, 2
Ob and the case-side partition walls 21a and 21b suppress the diffusion of the cooling air, concentrate the cooling air around the heat sink 14, and improve the cooling efficiency.

Further, according to the configuration of this embodiment, both switching elements 15a, 15b are connected to both heat sinks 14a,
14b, the electrical connection length of the two switching elements 15a and 15b is short, and in this embodiment in which the switching elements are driven by two stones, the delay of the switching operation is reduced. The electrical loss applied to the element 15 can be reduced, and the amount of heat generated by the switching element 15 can be reduced.

When the cooling fan 13 breaks down, the heat sinks 14a and 14b generate abnormal heat. However, the temperature sensor 25 attached to the heat sink 14b detects an abnormal temperature rise and stops the drive circuit 30. If the temperature sensor 25 or the like fails, the main body case 22
However, in the present embodiment, the flange portions 19a and 19 on opposite sides where the positions where the heat sinks 14a and 14b are fixed face each other are likely to occur.
4, the ribs 23 and the fixing bosses 24a and 24b formed on the main body case 22 supporting the heat sinks 14a and 14b are softened by abnormal heat generation as shown in FIG. 4, and the heat sinks 14a and 14b have a center of gravity. The heat sinks 14a and 14b having different electric potentials are brought into contact with each other, and the heat sinks 14a and 14b having different electric potentials are brought into contact with each other to electrically short-circuit, a safety device such as a fuse is operated, and as a result, smoke and ignition are suppressed. it can.

[0026]

As described above, according to the first aspect of the present invention, the two switching elements are cooled in a well-balanced and efficient manner, and the distance between the two switching elements is reduced as much as possible. Thus, it is possible to provide a cooling device for an electromagnetic cooker in which a significant loss is reduced.

A second aspect of the present invention is to provide a cooling device for an electromagnetic cooker using two switching elements which is safe and has good assemblability without generating smoke or ignition even if a cooling fan fails. it can.

According to the third aspect of the present invention, it is possible to provide a cooling device for an electromagnetic cooker in which cooling air can be efficiently used and cooling performance is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a cooling device of an electromagnetic cooker according to an embodiment as viewed from a rear surface.

FIG. 2 is a cross-sectional view of a main part of the cooling device of the electromagnetic cooker according to the embodiment as viewed from above.

FIG. 3 is a side sectional view of the electromagnetic cooker in the embodiment.

FIG. 4 is a cross-sectional view of a main part when the cooling device of the electromagnetic cooker in the embodiment is abnormal.

FIG. 5 is a side sectional view of a conventional electromagnetic cooker.

[Explanation of symbols]

 13 cooling fan 14a, 14b heat sink 15a, 15b switching element 19a, 19b flange portion 20a, 20b heat sink side partition wall 21a, 21a case side partition wall 24a, 24b fixing boss 30 drive circuit 31 heating coil

Claims (3)

(57) [Claims] 1. A heat sink, a heat sink, a drive circuit, and an axial-flow type cooling fan are provided inside a main body, and a heat sink is located at a substantially symmetrical position with a plane perpendicular to a rotation axis of the cooling fan as a plane of symmetry. A switching element is provided on the inner surfaces of both heat sinks facing each other and near the rotation center of the cooling fan, the switching elements are electrically connected, and both heat sinks are cooled by blowing air from the cooling fan. A cooling device for an electromagnetic cooker driven by two switching elements. 2. A heat sink, a heat sink, a drive circuit, and a cooling fan are provided inside the main body, the heat sinks are arranged to face each other, flange portions of the heat sinks are protruded from the opposing surfaces of both heat sinks, and the lower surfaces of the heat sinks are made of resin. A cooling device for an electromagnetic cooker, comprising a fixing boss for fixing a heat sink from its resin surface, and driven by two switching elements fixing a flange portion of the heat sink and the fixing boss. 3. A heat sink, a heat sink, a drive circuit, and a cooling fan are provided inside the main body, the heat sinks are arranged facing each other, and the two heat sinks are driven by two switching elements provided with partition walls on opposite sides of the heat sinks. Cooling device for induction cooker.